The native APIs are Objective-C (iOS, Mac) and Java (Android), but an optional internal REST API adapter allows it to be called from other languages like JavaScript and C#, for use in apps built with PhoneGap, Titanium or MonoTouch.

MYUtilities (portions of which are copied into the vendor/MYUtilities directory) is under the BSD License.

SQLite3-unicodesn by Alexey Illiaronov, is in the public domain, but we wanted to say thanks anyway.

YAJL, by Lloyd Hilael, is under the ISC license (which appears similar to BSD.)

These are all permissive, commercial-friendly licenses, and you can abide by them simply by putting copyright and permission notices for each in your app's UI / credits / README. For details read the individual licenses.